jessup



UNITED STATES PATENT OFFICE.

JOHN C. JESSUP, OF NEW YORK, ASSIGNOR TO ELON HUNTINGTON, OF

ROCHESTER, N. Y.

PROCESS OF GRINDING COLORS.

SPLLIPICA'IION forming part of Letters Patent No. 317,367, dated May 5, 1885.

Application filed October :21, 1882. (No specimens.)

To aZZ whom .0 may concern:

Be it known that I, JOHN G. JEssUP, a citizen of the United States, residing at the city of New York, in the county and State of New York, have invented a new and useful Improvement in the Process of Grinding Colors; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

Heretofore in preparing colors in oil the dry color and oil in proper proportion have been placed together in the mill and ground together. This process of grinding in oil is slow, and the quantity which can be ground at one time in a single mill is limited and comparatively small. Colors can be ground in water much more rapidly and in much greater quantity at one time than when ground in oil; so that fewer machines are used, and much less time occupied in grinding the same quantity of color in water than in grinding it in oil.

It is the object of my invention to produce oil-colors with nearly the same economy of time, labor, and machinery as when ground in water; and to this end my invention consists in first grinding the colors in water, then mixing with the pulp a suflicient quantity of oil for the dry color used, and afterward evaporating the water by means of heat, leaving the color and oil wellmixed together. There is such a difference in degrees of temperature between the boiling-points of water and oil, respectively, that I am able to drive off all the water in the form of steam without losing a single drop of oil, or in any way injuring it in the slightest degree.

To carry out my invention, I grind a quantity of color in Water in an ordinary grindingmill and in the ordinary way. When sufficiently ground, I mix with it the quantity of oil necessary for the quantity of color, which can be done readily and rapidly. I then put the whole mixture into an ordinary jacketkettle, or other receptacle adapted to the purpose, and apply heat in the form of steam or otherwise until the water has been all converted into steam and passed off, leaving the oil and color thoroughly mixed. It is then returned to the mill, where in a short time it receives the requisite finish and is now ready for the market.

I do not claim the process of grinding colors in water, nor the process of grinding colors in oil, both of which, I am aware, are old.

Having fully described my invention, what I desire to claim, and secure by Letters Patent, 1s

1. In the preparation of oil-colors, the process of first grinding the color in water, mixing oil with the pulp, and then evaporating the water by means of heat, so as to leave the oil and color mixed and free from water, and afterward grinding the same to a finish.

2. The process of combining oil and color by mixing oil with pulp of color and water and driving off the water in the form of steam by means of heat.

JOHN G. JESSUP.

\Vi tnesses:

JAMES C. llIURRAY, GEO. W. \VALLAOE. 

